Lipid mixture for infant nutrition

ABSTRACT

The subject invention includes a composition comprising at least one triglyceride, at least one phospholipid and at least one poly-unsaturated fatty acids (LC-PUFA); wherein at least about 1% of the LC-PUFA in the composition is conjugated to said phospholipid and uses thereof.

RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 12/740,543 filed Jul. 21, 2010 which is the United StatesNational Stage Application of International Application No.PCT/IL2008/001437, filed Nov. 2, 2008, which was published asInternational Publication No. WO 2009/057121, and which claims benefitof U.S. Patent Application No. 60/996,109 filed Nov. 7, 2007. Allapplications are incorporated by reference in their entirety herewith.

FIELD OF THE INVENTION

This invention relates to the field of infant nutrition.

BACKGROUND OF THE INVENTION

The quantity and quality of nutrient supply during infancy has immediateconsequences on growth, body composition, health, and well-being and hasimportant long-term consequences on organ development and function,disease risks, as well as cognitive ability in later life.

In human breast milk (HBM), about 50% of the dietary calories aresupplied as milk fat. Human Milk Fat (HMF) is composed of about 30-40g/L lipids. Of those, approximately 98% are triglycerides, 0.3-1%phospholipids, and 0.4% cholesterol [WO05/051091, WO 06/114791].

(Dietary) lipids, such as those found in HBM, are indispensable for e.g.normal growth and development as major building blocks of cell membranesand tissues, and are e.g. important in signal transduction processes andin a variety of biochemical and biosynthetic pathways. Many lipids, andespecially triglycerides, are part of human nutrition on a daily basis.

Triglyceride fats, or triglycerides, are the main energy source ofnewborn infants (Hamosh et al., Pediatrics 1985, 75 (suppl):146-150). Inaddition to providing 40% to 50% of the total calories in human milk orformula, triglycerides are essential to normal development since theyprovide fatty acids necessary for brain development, are an integralpart of cell membranes, and are a vehicle for fat soluble vitamin andhormones in milk. Furthermore, these energy rich triglycerides can bestored in the body in nearly unlimited amounts in contrast to thelimited storage capacity for carbohydrates and proteins.

The triglyceride composition of HMF is unique in its fatty acidcomposition and distribution. HMF is characterized in a total palmiticacid (C16:0) content of about 17-25%, of which about 70% are positionedat the sn-2 position of triglycerides [WO 05/051091]. Additionally, sn-1and sn-3 positions are rich in unsaturated fatty acids, especiallymonounsaturated fatty acids, such as oleic acid (C18:1), which is ofgreat importance to the infant's nutrition and development.

The sn-1 and sn-3 positions of vegetable fats are rich in saturatedfatty acids and are thus not suitable for infant nutrition. Hence,advanced infant formulas include structured fats produced to mimic theunique structure and characteristics of HMF.

Phospholipids are an essential nutritional component of HBM. Althoughphospholipid composition remains constant and is not influenced by amother's diet, the level of phospholipids in HBM changes with the age ofthe infant.

Phospholipids are composed of five major moieties: sphingomyelin (SM),phosphatidylcholine (PC), phosphatidylethanolamine (PE),phosphatidylserine (PS), and phosphatidylinositol (PI). [Thompkinson D Ket al. Comprehensive Reviews In Food Science And Food Safety 6:79-102(2007)].

Some phospholipids, and especially those extracted from soybean, areused as dietary supplements and a variety of health benefits areassociated with their intake. These benefits include the improvement ofcognitive functions, improvement of memory and concentration,maintenance of cellular membrane composition, and contribution togeneral well-being. Phospholipids and lecithins are a source of cholineand they enhance the bio-availability of other nutrients andtherapeutics.

Poly-unsaturated fatty acid (PUFA) levels in HBM vary widely dependingon the type of fat consumed by a mother. Still, compared to cow milkfat, a fairly broad spectrum of fatty acids and a high content ofunsaturated fatty acids, particularly linoleic acid, are present in HBM.In formulae based on cow milk on the other hand, blends of vegetable oilare added to provide an adequate amount of PUFAs, including linoleicacid and others.

Also glycerophospholipids, sphingomyelin, cholesterol and theirderivatives, even though they are found in relatively small amounts inHBM, play an important role in nutrition of developing infants, and playessential roles in all physiological systems and cycles of the humanbody.

Infants who cannot be breast-fed or who should not receive HBM, or forwhom HBM is not available, require breast milk substitutes. The mostappropriate alternatives to human milk are infant formulae. Suchindustrially prepared formulae are based on bovine milk or are derivedfrom a vegetarian source such as soybeans, and try to simulate thecomposition and biological properties of HBM. These known substitutesattempt to mimic the triglyceride content of HBM.

It is an object of the present invention to provide an improvedsubstitute human milk composition comprising the imperative buildingblocks found in. HMF comprising triglycerides, phospholipids and fattyacids, having benefits associated with mental and physical developmentof an infant together with benefits associated with intestinaldevelopment and function of an infant.

SUMMARY OF THE INVENTION

The subject invention thus provides a composition comprising at leastone triglyceride, at least one phospholipid and at least one long chainpoly-unsaturated fatty acid (LC-PUPA); said at least on triglyceridebeing a compound of formula I:

-   -   wherein R₁, R₂ and R₃ may be identical or different and are each        independently selected from H or an acyl group, wherein the acyl        group is selected from saturated fatty acid, mono-unsaturated        fatty acid and long chain poly-unsaturated fatty acid (LC-PUFA)        residues;    -   said at least one phospholipid being a compound of formula II:

-   -   in which R₄ and R₅ are each a substituent having independently        the meanings of R₁, R₂, R₃; and in which    -   R₆ is selected from choline, inositol, ethanolamine and serine;        and wherein    -   at least about 1% of the LC-PUFA in the composition is        conjugated to said at least one phospholipid.

The subject invention further provides uses of the compositions of theinvention.

DETAILED DESCRIPTION OF THE INVENTION

In a first aspect of the invention, there is provided a compositioncomprising at least one triglyceride, at least one phospholipid and atleast one long chain poly-unsaturated fatty acid (LC-PUFA); said atleast on triglyceride being a compound of the following formula I:

-   -   wherein R₁, R₂ and R₃ may be identical or different and are each        independently selected from H or an acyl group, wherein the acyl        group is selected from saturated fatty acid, mono-unsaturated        fatty acid and long chain poly-unsaturated fatty acid (LC-PUFA)        residues;    -   said at least one phospholipid being a compound of the following        formula II:

-   -   in which R₄ and R₅ are each a substituent having independently        the meanings of R₁, R₂, R₃; and in which    -   R₆ is selected from choline, inositol, ethanolamine and serine;        and wherein    -   at least about 1% of the LC-PUFA in the composition is        conjugated to said at least one phospholipid.

A composition (blend) of the invention typically comprises a mixture ofsaid triglycerides of formula I, said phospholipids of formula II andLC-PUFAs (in free form and in conjugated form). A mixture of theinvention typically comprises two or more triglycerides of formula I,two or more phospholipids of formula II and LC-PUFAs, wherein themixture typically comprises (i) free LC-PUFAs, (ii) LC-PUFAs conjugatedto the triglycerides (R₁ and/or R₂ and/or R₃) and (iii) LC-PUFAsconjugated to the phospholipids (R₄ and/or R₅).

In one embodiment, said LC-PUFA is one or both of an omega-3 or an omega6 fatty acid. In a specific embodiment said LC-PUFA comprisesdocosahexaenoic acid (DHA) and/or arachidonic acid (AA).

In one embodiment, the weight content of AA is larger than that of DHA.In a further embodiment, the weight content ratio between AA and DHA isat least about 1.1. In a further embodiment, the weight content ratiobetween AA and DHA is at least about 1.3. In yet a further embodiment,the weight content ratio between AA and DHA is at least about 1.5. In afurther embodiment, the weight content ratio between AA and DHA is atleast about 2. In yet another embodiment, the weight content ratiobetween AA and DHA is at least about 3. In another embodiment, theweight content ratio between AA and DHA is at least about 10.

In a further embodiment, R₅ is an LC-PUFA residue. In anotherembodiment, said LC-PUFA residue is an omega-3 or an omega-6 fatty acidresidue. In a further specific embodiment, said LC-PUFA is DHA or AA.

In yet a further embodiment, R₄ is an LC-PUFA residue. In anotherembodiment, said LC-PUFA residue is an omega-3 or an omega-6 fatty acidresidue. In a further specific embodiment, said LC-PUFA is DHA or AA.

In a specific embodiment, at least about 2% (w/w) of the LC-PUFA contentof the formulation is conjugated to at least one phospholipid. In yet afurther embodiment at least about 5% (w/w) of the LC-PUFA content of theformulation is conjugated to at least one phospholipid. In yet a furtherembodiment at least about 10% (w/w) of the LC-PUFA content of theformulation is conjugated to at least one phospholipid. In anotherembodiment at least about 20% (w/w) of the LC-PUFA content of theformulation is conjugated to at least one phospholipid. In yet anotherembodiment at least about 50% (w/w) of the LC-PUFA content of theformulation is conjugated to at least one phospholipid.

In one embodiment, at least 1% of the conjugated LC-PUFA is conjugatedat position sn-2 of said at least one phospholipids. In a furtherembodiment, at least about 2% of the conjugated LC-PUFA is conjugated atposition sn-2 of said at least one phospholipid. In another embodiment,at least about 33% of the conjugated LC-PUFA is conjugated at positionsn-2 of said at least one phospholipid. In a further embodiment, atleast about 40% of the conjugated LC-PUFA is conjugated at position sn-2of said at least one phospholipid. In yet another embodiment, at leastabout 45% of the conjugated LC-PUFA is conjugated at position sn-2 ofsaid at least one phospholipid. In another embodiment, at least about50% of the conjugated LC-PUFA is conjugated at position sn-2 of said atleast one phospholipid. In yet a further embodiment, at least about 60%of the conjugated LC-PUFA is conjugated at position sn-2 of said atleast one phospholipid. In another embodiment, at least about 70% of theconjugated LC-PUFA is conjugated at position sn-2 of said at least onephospholipid.

In another embodiment the total amount of phospholipids in thecomposition is at least about 0.1%. In another embodiment, the totalamount of phospholipids in the composition is at least about 0.5%. In afurther embodiment, the total amount of phospholipids in the compositionis at least about 1%. In another embodiment, the total amount ofphospholipids in the composition is at least about 2%. In anotherembodiment, the total amount of phospholipids in the composition is atleast about 5%. In a further embodiment, the total amount ofphospholipids in the composition is at least about 7%. In a furtherembodiment, the total amount of phospholipids in the composition is atleast about 10%. In a further embodiment, the total amount ofphospholipids in the composition is at least about 15%. In a furtherembodiment, the total amount of phospholipids in the composition is atleast about 20%. In a further embodiment, the total amount ofphospholipids in the composition is at least about 35%. In a furtherembodiment, the total amount of phospholipids in the composition is atleast about 50%.

In a further embodiment, said triglyceride and/or said phospholipid arederived from at least one raw lecithin material selected from the groupconsisting of vegetable, marine and aquaculture organism.

In one aspect of the present invention, there is provided apharmaceutical composition comprising a composition of the presentinvention.

Suitable routes of administration for the compositions of the subjectinvention are oral, buccal, sublingual, via feeding tube, topical,transdermal, or parenteral (including subcutaneous, intramuscular,intravenous and intradermal) administration. In a specific embodiment,the compounds can be administered orally.

The exact dose and regimen of administration of the composition willnecessarily be dependent upon the therapeutic or nutritional effect tobe achieved and may vary with the particular formula, the route ofadministration, and the age and condition of the individual subject towhom the composition is to be administered.

The present invention thus also provides pharmaceutical compositions ofthe invention in admixture with pharmaceutically acceptable auxiliaries,and optionally other therapeutic agents. The auxiliaries must be“acceptable” in the sense of being compatible with the other ingredientsof the composition and not deleterious to the recipients thereof.

In one embodiment, the pharmaceutical composition further comprises atleast one pharmaceutically active agent.

The compositions of the invention may be prepared by any method wellknown in the art of pharmacy. Such methods include the step of bringingin association the ingredients with any auxiliary agent. The auxiliaryagent(s), also named accessory ingredient(s), include those conventionalin the art, such as carriers, fillers, binders, diluents, disintegrants,lubricants, colorants, flavouring agents, anti-oxidants, and wettingagents.

Pharmaceutical compositions suitable for oral administration may bepresented as discrete dosage units such as pills, tablets, dragées orcapsules, or as a powder or granules, or as a solution or suspension.

For parenteral administration, suitable compositions include aqueous andnon-aqueous sterile injection. The compositions may be presented inunit-dose or multi-dose containers, for example sealed vials andampoules, and may be stored in a freeze-dried (lyophilised) conditionrequiring only the addition of sterile liquid carrier, for examplewater, prior to use. For transdermal administration, e.g. gels, patchesor sprays can be contemplated.

The invention further provides a commercial package for preparing aformula comprising: (a) a composition according to the invention whichupon administration to a subject for example, improves, maintains ortreats conditions associated with mental and physical development of aninfant, (b) optionally at least one of physiologically acceptableprotein, carbohydrate, vitamin, mineral, amino acid, nucleotide andactive or non-active additive; (c) optionally at least onephysiologically acceptable carrier or diluent for carrying theconstituent/s defined in (a) and (b); (d) means and receptacles foradmixing the constituents defined in (a), (b) and/or (c); and (e)instructions for use such as, but not limited to terms of storage,instructions for preparation of the formula for administration, requireddilutions, dosages, frequency of administration and the like.

A commercial package in accordance with the invention may also contain acomposition of the invention in a ready-to-use form, together withinstructions for use. Dosages are usually determined according to age,weight, sex and condition of the subject, in accordance with goodmedical practice known to the attending physician and other medicalpersonnel.

In order to obtain a desired formula of the invention, a composition ofthe invention may be mixed with other components such as, but notlimited to a protein source, a carbohydrate source, minerals, vitamins,nucleotides, amino acids and optionally at least one of a carrier,diluent, additive or excipient, all of which are suitable for mammalconsumption and/or administration and are pharmaceutically acceptable.

In one aspect of the present invention there is provided a nutritionalcomposition comprising a composition of the invention.

A nutritional composition as used herein can be any nutritionalcomposition including, but not limited to, human milk fat substitute,infant formula, dairy product, ice-cream, biscuit, soy product, bakery,pastry and bread, sauce, soup, prepared food, frozen food, condiment,confectionary, oils and fat, margarine, spread, filling, cereal, instantproduct, infant food, toddler food, bar, snack, candy and chocolateproduct.

In another aspect of the invention, there is provided a nutraceuticalcomposition comprising a composition of the invention.

A nutraceutical composition as used herein can be any nutraceutical,which can be any substance that may be considered a food or part of afood and provides medical or health benefits, including the preventionand treatment of disease. Such nutraceutical compositions include, butare not limited to, a food additive, a food supplement, a dietarysupplement, genetically engineered foods such as for example vegetables,herbal products, and processed foods such as cereals, soups andbeverages and stimulant functional food and pharmafood.

In yet a further aspect of the invention there is provided a functionalfood comprising a composition according of the invention.

A functional food as used herein can be any functional food, including,but not limited to, dairy product, ice-cream, biscuit, soy product,bakery, pastry and bread, sauce, soup, prepared food, frozen food,condiment, confectionary, oils and fat, margarine, spread, filling,cereal, instant product, drinks and shake, infant food, toddler food,bar, snack, candy and chocolate product.

In a further aspect of the invention there is provided an infant formulacomprising a composition of the invention.

An infant as used herein is meant to encompass a human infant or anynon-human mammal infant. An infant as used herein is meant to encompassany infant, such as, but not limited to, a newborn, a preterm and terminfant, small premature infants, infants with very low birth weight(VLBW) or extreme low birth weight (ELBW) particularly those withgeneral immaturity, for example of the gastrointestinal track or anyother health risks known to a person skilled in the art.

In another aspect of the invention there is provided a method forimproving, promoting or maintaining the development of cognitivefunctions in an infant comprising administering to said infant acomposition of the invention.

The phrase “improving, promoting or maintaining” as used herein is meantto encompass enhancing, advancing, supporting, progressing, retaining,keeping, preserving or sustaining any desired developmental function ina mammalian infant. Such developmental functions include, but are notlimited to, development of cognitive functions in an infant, developmentof brain and retina in an infant, development of visual acuities in aninfant, reduction of lipid peroxidation in an infant, growth quality ofan infant, central nervous system (CNS) development in an infant and soforth.

The term “development of cognitive functions in an infant” as usedherein is meant to encompass the development of a range of functions andabilities such as, but not limited to, intelligence, creativity(generate and open to new ideas, perceive new relationships), memory(encoding, storage, retrieval), executive functions (dealing withnovelty, planning and implementation, monitoring performance, vigilance,inhibition of task irrelevant info), cognitive resources (speed ofinformation processing, working memory capacity, attentional capacity),attention, learning, perception, action, planning, problem solving andmental imagery.

A well known method of assessing cognitive development in an infant isan assessment of the infant's mental development index (MDI) inaccordance with the Bayley neuro-developmental scales (Bayley, N. TheBayley Scales of Infant Development II. New York: New York PsychologicalCorp., 1993).

In a further aspect of the invention, there is, provided a method forimproving, promoting or maintaining the development of brain and retinain an infant comprising administering to said infant a composition ofthe invention.

The term “development of brain and retina in an infant” as used hereinis meant to encompass processes such as, but not limited to, thoseresulting in progression of the brain and retina over time, from itsformation to the mature structure. The result of brain development isresponsible for the coordination and control of bodily activities andthe interpretation of info nation from the senses (such as for examplesight, hearing, smell, etc.).

In another aspect of the invention, there is provided a method forimproving, promoting or maintaining the development of visual acuitiesin an infant comprising administering to said infant a composition ofthe invention.

The term “development of visual acuities in an infant” as used herein ismeant to encompass the eye's ability to resolve fine details or smalldistances, as measured by any means suitable in the art, includingelectro-retinography. “Enhanced visual acuity” refers to any improvementin the eye's ability to resolve fine details or small distances, asmeasured by any means suitable in the art.

By another one of its aspects the present invention provides a methodfor reducing lipid peroxidation in an infant comprising administering tosaid infant a composition of the invention.

The term “reducing lipid peroxidation in an infant” as used herein ismeant to encompass the amelioration, prevention, slowing down of theoxidative deterioration of lipids containing any number of carbon-carbondouble bonds and preventing inflammation.

By a further aspect of the invention, there is provided a method forimproving, promoting or maintaining the growth quality of an infant byadministering to said infant a composition of the invention.

The term “growth quality of an infant” as used herein is meant toencompass weight gain, changes in length and head circumference, andother additional physiological development as given in growth referencesdata and physical examination procedures known to a person skilled inthe art.

In another aspect of the invention, there is provided a method forimproving, promoting or maintaining the CNS development in an infantcomprising administering to said infant a composition of the invention.

The term “CNS development in an infant” as used herein is meant toencompass any processes such as, but not limited to, those resulting inthe progression of the central nervous system over time, from itsformation to the mature structure and function.

In yet a further aspect of the invention, there is provided a method forenhancing intestinal absorption of omega-3 and/or omega-6 fatty acids inhealthy, non-healthy and preterm infants comprising administering tosaid infant the composition of the invention

The term “enhancing intestinal absorption of omega-3 and/or omega-6fatty acids” as used herein is meant to encompass improving andincreasing processes such as, but not limited to, those by whichnutrients omega-3 and/or omega-6 fatty acids are absorbed from thecontents of the intestine.

In another aspect of the invention there is provided a method forimproving, promoting or maintaining intestinal maturity in infantscomprising administering to said infant the composition of theinvention.

The term “improving, promoting or maintaining intestinal maturity ininfants” as used herein is meant to encompass for example promoting ofnormal growth and maturation of the gastro-intestinal tract, restoringor maintaining gastrointestinal function, promoting villous growth,promoting proliferation of the small and large intestine in a healthymammal, e.g., to enable increased absorption of nutrients.

The invention further encompasses a use of a composition of theinvention, for the preparation of a pharmaceutical or nutraceuticalcomposition for treatment of infants.

In one embodiment, a composition of the invention is prepared from anatural, synthetic or semi-synthetic source. In a further specificembodiment, said natural source is any one of plant, animal ormicroorganism source. In yet a further embodiment, the production ofsaid lipid composition involves an enzymatic catalysis.

In another embodiment, a composition of the invention may be synthesizedby polar extraction from a marine, a plant, animal or micro-organismssource. Synthetic routs appropriate for synthesizing a composition ofthe invention are described in “Lecithins: Sources Manufacture and uses”Bernard F. Szuhaj Ed. (1989) which is herein incorporated by reference.

In an embodiment of the invention, the pharmaceutical or nutraceuticalcompositions are in a dosage delivery form.

In one embodiment, a composition of the subject invention furthercomprises at least one triglyceride of formula I, having at least 30%(w/w) of total palmitic acid conjugated at the sn-2 position.

In another embodiment, a composition of the subject invention furthercomprises (is mixed with) at least one triglyceride of formula I havingthe following conjugated fatty acid profile:

-   -   0-10% C8:0 fatty acids out of the total fatty acids;    -   0-10% C10:0 fatty acids out of the total fatty acids;    -   0-22% C12:0 fatty acids out of the total fatty acids;    -   0-15% C14:0 fatty acids out of the total fatty acids;    -   15-55% C16:0 fatty acids out of the total fatty acids of which        at least 30% is conjugated at the sn-2 position of triglyceride;    -   1-7% C18:0 fatty acids out of the total fatty acids;    -   20-75% C18:1 fatty acids out of the total fatty acids;    -   2-40% C18:2 fatty acids out of the total fatty acids;    -   0-8% C18:3 fatty acids out of the total fatty acids; and    -   other fatty acids present in levels of less than 8% of the total        fatty acids.

As used herein, the term “acyl group” relates to an organic radicaldenoted —C(═O)R, wherein R is selected from saturated, mono-unsaturatedand polyunsaturated fatty acid residue.

As used herein, the term “fatty acid” is meant to encompass a carboxylicacid with a unbranched aliphatic tail (chain) typically having between 4and 28 carbon atoms, which is either saturated or unsaturated having oneunsaturated bond (mono-unsaturated fatty acids) or two or moreunsaturated bonds (poly-unsaturated fatty acids). It should be notedthat when at least one unsaturated bond of an unsaturated fatty acid isat least one double bond, said at least one double bond may be either inthe cis configuration or in the trans configuration.

Non-limiting examples of saturated fatty acids which may be used in thisinvention include: Butyric acid (Butanoic acid, C4:0), Caproic acid(Hexanoic acid, C6:0), Caprylic acid (Octanoic acid, C8:0), Capric acid(Decanoic acid, C10:0), Laurie acid (Dodecanoic acid, C12:0), Myristicacid (Tetradecanoic acid, C14:0), Palmitic acid (Hexadecanoic acid,C16:0), Stearic acid (Octadecanoic acid, C18:0), Arachidicaicd(Eicosanoic acid, C20:0), Behenic acid (Docosanoic acid C22:0).

Non-limiting examples of mono-unsaturated fatty acids which may be usedin this invention include: Myristoleic acid (ω-5, C14:1), Palmitoleicacid (ω-7, C16:1), Oleic acid (ω9, C18:1) and Erucic acid (ω-9, C22:1).

The term “long-chain polyunsaturated fatty acid (LC-PUFA)” as usedherein is meant to encompass fatty acids with unbranched aliphatic chainhaving at least 18 carbon atoms and at least two unsaturated bonds.

Non-limiting examples of LC-PUFA are Alpha-linolenic acid (ALA, ω-3,C18:3), Eicosapentaenoic acid (EPA, ω-3, C20:5), Docosahexaenoic acid(DHA, ω-3, C22:6), Docosapentaenoic acid (DPA, ω-3, 22:5), Linoleic acid(LA, ω-6, C18:2), Arachidonic acid (AA, ω-6, C20:4).

The term “omega-3 fatty acid” as used herein is meant to encompass acarboxylic acid with a long unbranched aliphatic chain which ispolyunsaturated, wherein the first carbon-carbon double bond is locatedat the ω-3 position (i.e. on the third carbon from the end of thealiphatic chain). Non limiting examples of omega-3 fatty acids which maybe used in the composition of the invention include: Alpha-linolenicacid (ALA, ω-3, C18:3), Eicosapentaenoic acid (EPA, ω-3, C20:5),Docosahexaenoic acid (DHA, ω-3, C22:6) and Docosapentaenoic acid (DPA,ω-3, 22:5).

The term “omega-6 fatty acid” as used herein is meant to encompass acarboxylic acid with a long unbranched aliphatic chain which ispolyunsaturated, wherein the first carbon-carbon double bond is locatedat the ω-6 position (i.e. on the sixth carbon from the end of thealiphatic chain). Non limiting examples of omega-6 fatty acids which maybe used in the composition of the invention include: Linoleic acid (LA,ω-6, C18:2) and Arachidonic acid (AA, ω-6, C20:4).

The invention is further described in the following examples, which arenot in any way intended to limit the scope of the inventions as claimed.

EXAMPLES Example 1 Preparation of Lipid Fractions Used for thePreparation of Compositions (Blends) of the Invention

Lipid Fraction 1: Extraction of Biomass Enriched with Archidonic Acid

Mortierella Alpina, strain ATCC32222 was grown in 1 liter media in a 2liter shake flask. Growth media was based on glucose (30 g/l) as carbonsource and yeast extract (15 g/l) as Nitrogen source. In addition, thefollowing components were added: Potassium dihydrogen phosphate KH₂PO₄(7 g/l), Disodium hydrogen phosphate Na₂HPO₄ (2 g/l), Magnesium sulfateMgSO₄.7H₂O (1.5 g/l), CaCl₂.2H₂O (0.1 g/l), FeCl₃.6H₂O (8 mg/l),ZnSO₄.7H₂O (1 mg), CuSO₄.5H₂O (0.1 mg/l), Co(NO₃)₂.6H₂O (0.1 mg/l),MnSO₄.5H₂O (0.1 mg/l). After 8 fermentation days at 28° C., the biomasswas filtered, washed with DI water and dried in a vacuum oven at 25° C.to obtain 18 gr of dried biomass.

Lipid Fraction 2: Enrichment of Lipid Fraction 1

The dried biomass from lipid fraction 1 was subjected to an extractionprocedure by mixing with 100 ml mixture of hexane and ethanol (80:20v/v) for 2 hours at 40° C. in a shaker incubator at 200 RPM. Biomass wasfiltered and washed. The filtrate was evaporated under reduced pressureto obtain 5.1 gr of lipid fraction.

Lipid Fraction 3: Purification of Phospholipids Enriched with ARA

Oil essentially as produced in lipid fraction 2, was used as startingmaterial to obtain a pure phospholipid fraction. 10 gr of the oil weredissolved in 30 ml of absolute ethanol and loaded on a glass columnpacked with 200 gr of silica (Merck 60). About 1 liter of absoluteethanol was passed through the column and the outlet was analyzedcontinuously by TLC until a pure phospholipids fraction started toelute. Further washing of the column was done with about 3 liters ofethanol 96% (4% water) by increasing temperature to 60° C. in order toremove more of the phospholipids fraction. This fraction was collectedseparately, evaporated under reduced pressure to obtain about 0.3 gr ofpure phospholipids.

Lipid Fraction 4: Extraction of Lipid Fraction from Scizizochytrium SpBiomass

50 gr of biomass of the micro alga Schizochytrium sp was subjected to anextraction procedure by mixing with 250 ml of ethanol 96% (4% watercontent) for 2 hours at 40° C. in a shaker incubator at 200 RPM. Biomasswas filtered and washed. The filtrate was evaporated under reducedpressure to obtain 8.7 gr of oil.

Lipid Fraction 5: Selective Extraction of Lipid Fraction with HighTriglycerides Content

20 gr Biomass of the micro alga Schizochytriuni sp was subjected to anextraction procedure by mixing with 100 ml of acetone for 2 hours atambient temperature with a magnetic stirrer. Biomass was filtered andwashed. The filtrate was evaporated under reduced pressure to obtain 7.7gr of oil.

Lipid Fraction 6: Selective Extraction of Lipid Fraction with HighPhospholipids Content

The biomass obtained after production of lipid fraction 5 by acetoneextraction was subjected to an additional extraction using 100 ml ofhexane:ethanol (80:20 v/v) solvent mixture at temperature of 40° C. for2 hours in a shaker incubator at 200 RPM. After filtration andevaporation of the filtrate, 0.6 gr of paste-like material was obtained.

Lipid Fraction 7: Purification of Phospholipids Enriched with DHA

10 gr of paste-like material essentially as produced in lipid fraction6, was used as a starting material for phospholipids purificationprocess as described in order to produce lipid fraction 3. From 10 gr offeed 0.6 gr of pure phospholipids fraction was obtained.

Lipid Fraction 8: Industrial Production of Lipid Fraction Enriched withPhospholipids

1,000 Kg of fish meal from Herring source was extracted using 4,000liters mixture of ethanol:water (80:20 v/v) for 2 hours at 40° C. in a5,000 liters reactor equipped with an anchor type agitator. Biomass wasfiltered in a 1.5 m diameter basket centrifuge and washed. The filtratewas evaporated under vacuum using hot water in the jacket, in a 3,000batch evaporator equipped with a propeller type agitator. The paste likematerial obtained was re-dissolved in hexane, filtered again through abag filter and evaporated in the same evaporator under the sameconditions to obtain 46 Kg of a highly viscous lipid fraction.

Methods for Determination of the Content of the Lipid Fractions: 1.Determination and Quantification of Fatty Acid Composition:

Fatty acid methyl esters were prepared by basic methylation in thepresence of sodium methoxide dissolved in methanol and extracted byhexane. Fatty acid composition was analyzed by injection of the methylesters into Gas-Chromatograph instrument equipped with a capillarycolumn and flame ionization detector.

The GC (HP) instrument programmed under the following conditions:

-   -   OVEN—Initial temp—110° C., Final temp—250° C., Run time—41.50        min    -   FRONT INLET—Initial temp—350° C., Pressure—13.83 psi, Split        ratio—24.988:1,    -   Split flow—39.8 ml/min, Total flow—43.4 ml/min, Gas        type—nitrogen    -   FRONT DETECTOR—Temp.—250° C., Hydrogen flow—40.0 ml/min,    -   Air flow—400.0 ml/min

The quantification of the methyl esters was performed against internalstandard of C23:0.

2. Determination and Quantification of Phospholipid Content

Phospholipids content was measured either by ³¹P-NMR or by HPTLC.³¹P-NMR is a an accepted and widely used method for measuringphospholipid content (Analytical Biochemistry Volume 232, Issue 1,November 1995, Pages 1-6; Journal of Lipid Research Volume 27, 1986,386).

HPTLC method consists of applying a sample containing phospholipids onSilica plate, develop the plate in solvent mixture(Chloroform:Acetone:Methanol:Acetic acid and water=11:6.4:5:2.4:1(v/v)). After the development the plate is dried and stained withmixture of acidic CuSO₄. The quantification is performed by scanning theplate at 274 nm versus mixture of known phospholipid content.

3. Determination and Quantification of Triglyceride Content

The quantification of the triglycerides content was performed byinjection of the sample into the GC instrument equipped with a capillarycolumn and flame ionization detector. The GC is equipped with Agilentcolumn model J&W DB-1HT and programmed under the following conditions:

-   -   OVEN—Initial temp—160 c, Final temp—350 c, Run time—29.50 min    -   FRONT INLET—Initial temp—350 c, Pressure—13.83 psi, Split        ratio—24.988:1, Split flow—39.8 mL/min, Total flow—43.4 mL/min,        Gas type—nitrogen    -   FRONT DETECTOR— Temp.—350 c, Hydrogen flow—40.0 mL/min,    -   Air flow—400.0 mL/min

4. Analysis of Phospholipids Fatty Acid Composition

Fatty acid composition esterified to the phospholipids was analyzed bytwo-step process. The analyzed phospholipids were purified on thin-layerchromatography (TLC) plate (by the same solvent mixture of method 2),scrubbed from the silica with toluene and transformed to methyl estersfollowing procedure number 1.

5. Positional Analysis of Fatty Acid

Analysis of the positional distribution of phospholipids fatty acid wascarried out by a multistage procedure starting with a selectivehydrolysis of the sn-2 fatty acid by phospholipase A2 (PLA2). Theresulting 2-lyso-phosphlipid fraction was purified on a silica plate,transformed to methyl esters and analyzed by the GC as previouslydescribed procedure.

Table 1 details the composition of several lipid preparations,comprising triglycerides and phospholipids for use in the preparation ofcompositions of the subject invention.

TABLE 1 lipid fractions lipid lipid lipid lipid lipid lipid lipidfraction 2 fraction 3 fraction 4 fraction 5 fraction 6 fraction 7fraction 8 % Phospholipids 5.2 >95 1.8 <5 12.0 >95 45 % Triglycerides83.0 <5 NM 96.0 NM <5 NM Fatty acid (% w/w) of total fatty acids C14 1.10.4 6.6 6.0 2.8 1.3 C16 13.8 9.6 25.1 25.2 14.9 16.6 C18 9.1 2.4 0.6 0.60.3 0.3 1.3 C18:1n9 12.8 8.9 1.0 0.2 3.9 C18:2 n6 5.6 8.4 1.0 0.4 1.0C18:3 n3 3.9 6.1 0.4 0.4 0.2 C20:3n6 4.1 2.1 2.5 0.4 C20:4n6 41.2 21.31.3 1.3 0.9 1.2 0.5 C20:5n3 3.4 3.2 2.7 4.9 5.7 C22:5n3 16.3 17.7 10.412.3 C22:6n3 36.4 38.7 22.7 26.4 16.3 Fatty acid (% of fatty acidesterified to Phospholipids) C14 0.5 0.5 1.4 1.8 1.8 2.2 C16 13.7 13.721.7 23.7 23.7 29.8 C18 3.4 3.4 0.4 0.4 0.4 2.2 C18:1n9 12.7 12.7 1.20.2 0.2 18.0 C18:2 n6 12.1 12.1 3.1 0.6 0.6 C18:3 n3 8.8 8.8 C20:3n6 3.13.1 0.8 0.6 0.6 C20:4n6 30.4 30.4 2.1 1.7 1.7 C20:5n3 6.4 7.0 7.0 12.0C22:5n3 19.7 17.5 17.5 C22:6n3 32.2 37.7 37.7 31.0 LC-PUFA Total LC-PUFA% w/w 54.8 38.0 61.2 61.3 36.7 45.5 23.8 % LC-PUFA on PL 3.6 >95 1.314.9 >95 56.9 from total LC-PUFA % LC-PUFA at sn-2of >50 >50 >50 >50 >50 82.9 PL from total LC- PUFA of PL NM = notmeasured% Total LC-PUFA represents sum of % w/w of C18:2, C18:3, C20:3, C20:4,C20:5 and C22:6 fatty acids.% LC-PUFA on PL from total LC-PUFA is calculated by (LC-PUFA on PL as %w/w)/(Total LC-PUFA as % w/w)*100.% LC-PUFA at the sn-2 of phospholipids from total LC-PUFA onphospholipids is calculated by (% LC-PUFA at sn-2 of total sn-2positioned fatty acids)/(total LC-PUFA on phospholipids)*100.% LC-PUFA at the sn-2 of phospholipids from total LC-PUFA onphospholipids >50 is not based on a measured value but on an estimatedvalue.

Compositions (blends) of the invention comprising LC-PUFA enriched oils(Table 2) were prepared by mixing lipid fractions 2-8 (Table 1) witheach other.

Blends of the invention can further optionally be mixed with a fat blendsuch as, but not limited to, an sn-2 palmitic acid enriched fat blend asdescribed in PCT/IL2008/001311 (Table 5).

Optionally components from lipid fractions 4 and 6 are passed through asequence of refining stages including, degumming, bleaching anddeodorization before use in the blending procedure.

TABLE 2 LC-PUFA enriched compositions (blends) blend 1 blend 2 blend 3blend 4 blend 5 blend 6 blend 7 blend 8 blend 9 lipid fraction mixed (%)lipid fraction 2 50.0 43.5 54.5 73.2 28.6 90.1 50.0 47.6 40.0 lipidfraction 3 13.0 5.5 7.3 28.6 47.6 lipid fraction 4 50.0 lipid fraction 536.4 7.3 28.6 9.0 4.8 lipid fraction 6 43.5 0.0 7.3 0.9 lipid fraction 750.0 3.6 4.9 60.0 lipid fraction 8 14.3 % Phospholipids 52.6 20.5 11.916.9 36.5 4.8 3.5 50.1 62.1 % Triglycerides 41.5 NC 80.2 NC NC NC NC44.1 33.2 Fatty acid (% w/w) of total fatty acids C14 1.2 1.7 2.8 1.52.1 1.5 3.9 1.0 1.2 C16 15.2 13.7 17.8 14.5 13.9 14.8 19.4 12.3 15.4 C184.7 4.4 5.3 6.9 3.7 8.3 4.9 5.5 3.8 C18:1n9 6.5 6.7 7.5 10.0 6.8 11.66.9 10.3 5.2 C18:2 n6 3.0 3.5 3.5 4.7 4.2 5.0 3.3 6.7 2.5 C18:3 n3 1.92.5 2.6 3.3 3.0 3.5 2.1 4.8 1.5 C20:3n6 2.3 2.1 2.4 3.2 1.8 3.7 3.3 3.01.9 C20:4n6 21.2 21.1 24.1 31.9 18.3 37.2 21.2 29.8 17.2 C20:5n3 2.4 1.21.3 0.7 1.7 0.3 1.7 0.2 2.9 C22:5n3 6.1 4.5 6.9 2.7 5.1 1.7 8.2 0.8 7.4C22:6n3 13.2 9.9 15.1 5.8 13.4 3.7 18.2 1.8 15.8 Fatty acid (% of fattyacid esterified to Phospholipids) C14 1.2 1.1 0.4 0.6 0.6 0.5 1.0 0.51.3 C16 18.7 18.0 9.0 13.9 12.1 12.5 17.7 13.0 19.7 C18 1.9 2.1 2.0 2.82.2 3.0 1.9 3.2 1.6 C18:1n9 6.5 7.3 7.6 10.3 9.8 11.5 7.0 12.1 5.2 C18:2n6 6.3 7.1 7.3 9.8 6.9 10.9 7.6 11.5 5.2 C18:3 n3 4.4 5.0 5.3 7.1 5.07.9 4.4 8.4 3.5 C20:3n6 1.8 2.0 1.9 2.5 1.7 2.8 1.9 2.9 1.6 C20:4n6 16.017.9 18.3 24.7 17.4 27.4 16.3 29.0 13.2 C20:5n3 3.5 3.0 0.3 0.9 1.7 0.13.2 0.0 4.2 C22:5n3 8.8 7.6 0.6 2.1 0.0 0.2 9.9 0.0 10.5 C22:6n3 18.916.4 1.4 4.6 4.4 0.3 16.1 0.0 22.6 LC-PUFA Total LC-PUFA % w/w 50.2 44.755.9 52.3 47.4 55.2 58.0 47.1 49.2 % LC-PUFA on PL 43.8 18.9 5.2 11.720.0 3.0 2.5 38.5 53.6 from total LC-PUFA % LC-PUFA at sn-2 ofPL >50 >50 >50 >50 >50 >50 >50 >50 >50 from total LC-PUFA of PL AA:DHA1.6 2.1 1.6 5.5 1.4 10.1 1.2 16.2 1.1 NC = not calculated

% Total LC-PUFA represents sum of % w/w of C18:2, C18:3, C20:3, C20:4,C20:5 and C22:6 fatty acids.

% LC-PUFA on PL from total LC-PUFA is calculated by (LC-PUFA on PL as %w/w)/(Total LC-PUFA as % w/w)*100.

% LC-PUFA at the sn-2 of phospholipids from total LC-PUFA onphospholipids is calculated by (% LC-PUFA at sn-2 of total sn-2positioned fatty acids)/(total LC-PUFA on phospholipids)*100.

Ratio ARA:DHA is calculated as C20:4 (% w/w of total fatty acids)/C22:6(% w/w of total fatty acids).

Example 2 Infant Formula

Table 3 provides examples of known fat compositions of infant formula(first two columns of table 3), and an example of a fat composition ofinfant formula in accordance with the invention (third column of table3).

Table 4 provides examples of known fat compositions of infant formula(first two columns of table 4), and a further example of a fatcomposition of infant formula in accordance with the invention (thirdcolumn of table 4); This fat composition of the invention is prepared bye.g. admixing blend 5 of table 2 with an sn-2 palmitic acid enriched fatblend as described in PCT/IL2008/001311.

Table 5 provides the fatty acid profile of compositions (blends) of theinvention (Table 2) mixed with an sn-2 palmitic acid enriched fat blendas described in PCT/IL2008/001311.

Table 6 provides milk based infant formula in accordance with theinvention; and Table 7 provides soy-based infant formulas in accordancewith the present invention.

These infant formula compositions have been formulated in accordancewith:

-   1. Koletzko B. et al. Global Standard for the Composition of Infant    Formula: Recommendations of an ESPGHAN Coordinated International    Expert Group. Journal of Pediatric Gastroenterology and Nutrition    41(5):584-599 (2005).-   2. Alles M. et al. Current trends in the composition of infant milk    formulas. Current Paediatrics 14 (1): 51-63 (2004).-   3. Mathews A. Comparison of Triglycerides and Phospholipids as    Supplemental Sources of Dietary Long-Chain Polyunsaturated Fatty    Acids in Piglets. J. Nutr. 132:3081-3089 (2002).

An infant formula is thus prepared, comprising proteins, carbohydrates,fat, minerals, vitamins, etc. to yield a food product supplying aninfant with the major nutrients also found in human milk. 1 liter ofreverse osmosis (RO) water is added to a high shear mixer and heated to70° C. Mixer is turned on at high speed and 480 gr of lactose are addedgradually. Mixer speed is reduced and 250 gr of a fat blend (e.g. a fatblend essentially as described in PCT/IL2008/001311) is added.Thereafter 140 gr of skimmed milk, 90 gr of whey protein concentrate and20 gr of a mixture of minerals, vitamins and trace elements are added.To the obtained mixture, 20 gr of an LC-PUFA enriched lipid compositionof the invention, (Table 2) is added. The resulting mixture is passedthrough a pressure homogenizer and then spray dried to obtain around 1Kg of dried powder. Since the fat blend of the infant formula is furthermixed with an LC-PUFA enriched blend composition of the invention, thefatty acids composition in the infant formula results from thecombination of the fatty acids composition of both the fat blend and ofthe LC-PUFA enriched blend composition of the invention.

TABLE 3 Fat composition in infant formula: Formula Formula in accordancesupplemented with the invention Fatty acid with TG supplemented with TG(% of total Conventional as sources and PL as sources of fat) formula ofAA and DHA AA and DHA C12:0 8 ± 0.8 8 ± 0.8 8 ± 0.8 C14:0 3 ± 0.3 3 ±0.3 3 ± 0.3 C16:0 21 ± 4   21 ± 4   21 ± 4   C18:0 3 ± 0.3 3 ± 0.3 3 ±0.3 C18:1n-9 46 ± 6   44 ± 6   44 ± 6   C18:2n-6 16 ± 1.6  15 ± 1.5  15± 1.5  C18:3n-3 1.5 ± 0.15  1.2 ± 0.12  1.2 ± 0.12  C20:4n-6 0.6 0.6 C22:6n-3 0.3 0.3  Phospholipids (g/100 g) Total ND ND 1.35 PC ND ND 0.95PE ND ND 0.25 PI ND ND 0.05 PA ND ND 0.1  PS ND ND >0.1  TG =triglyceride PL = phospholipids ND = not detected

TABLE 4 Fat composition in infant formula: Formula Formula in accordancesupplemented with the invention with TG as supplemented with TG Fattyacid Conventional sources and PL as sources of % w/w formula of AA andDHA AA and DHA C12 8.7 8.7 8.4 C14 3.5 3.5 3.4 C16 21.0 21.0 20.7 C182.7 2.7 2.7 C18:1n9 44.4 44.4 42.9 C18:2 n6 16.4 16.4 15.9 C18:3 n3 1.51.5 1.6 C20:3n6 0.1 C20:4n6 0.7 0.7 C20:5n3 0.1 C22:5n3 0.2 C22:6n3 0.50.5 % phospho- ND ND 1.5 lipids ND = not detected

Table 5 describes fat fractions comprising fat blends from table 2. Fats1-6 of Table 5 are derived from blends 1, 2, 4, 5, 8 and 9 of Table 2and further comprise at least one triglyceride of formula I which hasthe following conjugated fatty acid profile:

-   -   0-10% C8:0 fatty acids out of the total fatty acids;    -   0-10% C10:0 fatty acids out of the total fatty acids;    -   0-22% C12:0 fatty acids out of the total fatty acids;    -   0-15% C14:0 fatty acids out of the total fatty acids;    -   15-55% C16:0 fatty acids out of the total fatty acids of which        at least 30% is conjugated at the sn-2 position of triglyceride;    -   1-7% C18:0 fatty acids out of the total fatty acids;    -   20-75% C18:1 fatty acids out of the total fatty acids;    -   2-40% C18:2 fatty acids out of the total fatty acids;    -   0-8% C18:3 fatty acids out of the total fatty acids; and    -   other fatty acids present in levels of less than 8% of the total        fatty acids.

TABLE 5 fat 1 fat 2 fat 3 fat 4 fat 5 fat 6 sn-2 palmitic acid 95 93.496.5 96 97 95 enriched fat blend (%) blend 1 (%) 5.0 blend 2 (%) 6.6blend 4 (%) 3.5 blend 5 (%) 4.0 blend 8 (%) 3.0 blend 9 (%) 5 %Phospholipids 2.6 1.4 0.6 1.5 1.5 3.1 % Triglycerides 97.1 NC NC NC 98.396.7 Fatty acid % w/w of total fatty acids C12 8.3 8.1 8.4 8.4 8.4 8.3C14 3.4 3.4 3.4 3.4 3.4 3.4 C16 20.7 20.5 20.8 20.7 20.7 20.7 C18 2.82.8 2.8 2.7 2.8 2.8 C18:1n9 42.5 41.9 43.2 42.9 43.4 42.4 C18:2 n6 15.715.6 16 15.9 16.1 15.7 C18:3 n3 1.5 1.6 1.6 1.6 1.6 1.5 C20:3n6 0.1 0.10.1 0.1 0.1 0.1 C20:4n6 1.1 1.4 1.1 0.7 0.9 0.9 C20:5n3 0.1 0.1 <0.1 0.1<0.1 0.1 C22:5n3 0.3 0.3 0.1 0.2 <0.1 0.4 C22:6n3 0.7 0.7 0.2 0.5 0.10.8 LC-PUFA Total LC-PUFA % w/w 19.5 19.7 19.1 19.1 18.8 19.5 % LC-PUFAesterified to 5.6 2.8 1.1 2 2.9 6.8 PL from total LC-PUFA AA:DHA 1.6 2.15.5 1.4 16.2 1.6 NC = not calculated

TABLE 6 Milk based infant formula composition: unit Powder (100 gr)General: Protein gram 11.1 Fat gram 25.9 Lactose gram 55.5 Water gram2.5 Ash gram 2.06 Vitamins: Vitamin A IU 1500 Vitamin D IU 300 Vitamin Emg 6 Vitamin K μg 15 Vitamin B1 μg 350 Vitamin B2 μg 450 Vitamin B6 μg222 Vitamin B12 μg 0.66 Niacin mg 2 Folic acid μg 45 Calcium mg 4.44Pantothenate mg 3 Biotin μg 11 Vitamin C mg 45 Minerals Calcium mg 326Phosphorus mg 219 Magnesium mg 37 Iron mg 7.4 Sodium mg 120.7 Potassiummg 373 Ca/P ratio 1.49 Amino acid profile Alanine mg 522 Arginine mg 368Asparatic acid mg 11.1 Cysteine mg 191 Glutamic acid mg 1423 Glycine mg244 Histidine mg 262 Isoleucine mg 761 Leucine mg 12.2 Lysine mg 10Methionine mg 270 Phenylalanine mg 461 Proline mg 962 Serine mg 681Taurine mg 37 Threonine mg 686 Tryptophan mg 180 Tyrosine mg 463 Valinemg 775

TABLE 7 Soy based infant formula: unit Powder (100 gr) General: Proteingr 15 Fat gr 27.54 Carbohydrate gr 51.5 Linoleic acid gr 4.5 Vitamins:Vitamin A IU 1500 Vitamin D IU 300 Vitamin E IU 10 Vitamin C mg 65Vitamin K μg 77 Vitamin B1 μg 345 Vitamin B2 μg 445 Vitamin B6 μg 327Vitamin B12 μg 1.5 Niacin mg 7 Folic acid μg 76 Pantothenic acid μg 4.5Biotin μg 25 Choline mg 58 Minerals Calcium mg 500 Phosphorus mg 300Magnesium mg 45 Iron mg 9.2 Zinc mg 4 Manganese μg 150 Copper μg 400Iodine μg 77 Sodium mg 200 Potassium mg 546 Chloride mg 400 Inositol mg25 Carnitine mg 10 Ca/P ratio 1.67 Araino acid profile Alanine mg 640Arginine mg 497 Asparatic acid mg 1385 Cysteine mg 242 Glutamic acid mg3065 Glycine mg 300 Histidine mg 382 Isoleucine mg 893 Leucine mg 1600Lysine mg 1360 Methionine mg 406 Phenylalanine mg 650 Proline mg 1113Serine mg 737 Taurine mg 51 Threonine mg 460 Tyrosine mg 621 Valine mg947

Infant formulas designed to mimic the different lactation periods can beprepared by controlling the levels of fat blend and of LC-PUFA enrichedblend composition of the invention.

Example 3 Effect of DHA and AA Conjugated Phospholipids in InfantFormula on Cognitive Development and Visual Acuity

The study includes three groups of infants fed with three infantformulas that differ only in their LC-PUFA fat content (Table 3).

Group I receives standard infant formula without DHA and AAsupplementation.Group II receives infant formula supplemented with standard DHA and AAsupplementation (i.e, DHA and AA conjugated to triglycerides only).Group III receives infant formula supplemented in accordance with thepresent invention, particularly with DHA and AA conjugated totriglycerides and phospholipids (i.e, a mix of DHA and AA conjugated totriglycerides and to phospholipids, whereas the ratio of the conjugatedtriglycerides and phospholipids is 1:1).

The cognitive development of the infants is measured by the Bayleyscales test (essentially as described in Pinelli J et al. Adv NeonatalCare 3(2):76-87 (2003)). The visual acuity of the infants is measured bythe visual evoked acuity test (essentially as described in Innis S M. J.Pediatr. 139(4):532-8 (2001)). Both tests are adapted to the age of theinfants. During the 6 months of formula feeding, the tests are performedat baseline and during the study approximately every one to two months.The infants in the third group (fed with infant formula comprising theDHA and AA conjugated to triglycerides and phospholipids according tothe invention) demonstrate better cognitive development and visualacuity as compared to the infants in the other two groups.

Example 4 Effect of DHA and AA Conjugated to Phospholipids within Dieton Cognitive Function Development in an Animal Model

The fatty acid (FA) docosahexaenoic acid (DHA, 22: 6n-3) is highlyenriched in membrane phospholipids of the central nervous system andretina. Neuronal pathways, such as those involved in learning, memory,spatial learning, etc. indicate cognitive function development. In thisstudy, a systematic assessment of neurodevelopmental and cognitivemilestones is performed in animal pups. The analyses includemeasurements of physical growth and maturation and evaluation ofneurological reflexes.

Study Design

Animals are fed with different diets and appearance of neural reflexesand reflex performance is examined after birth.

Study design is carried out according to Kiss et al, Development ofNeurological

Reflexes and Motor Coordination in Rats Neonatally Treated withMonosodium Glutamate, Neurotoxicity Research, 2005, VOL. 8(3,4). pp.235-244.

Diets

The animals received diets essentially as described in Table 3 or Table4:

Group I: reference diet, normal chow.

Group II: a synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) only.

Group III: synthetic diet: fat source is enriched with DHA and AAesterified to triglycerides (TG) and phospholipids (PL) (for example,fat blends 1-9, Table 2).

Growth

Weight is recorded every day until 3 weeks of age, then weekly. Bodylength (nasoanal length) is measured weekly.

Neurological Signs and Reflexes

Examinations of neurobehavioral development are started on the firstpostnatal day and carried out daily until postnatal day 21. Inspectionsare carried out for maturation of physical characteristics such as eyeopening, incisor eruption and ear unfolding. Pups are tested for thefollowing neurological signs and reflexes:

1. Righting reflex: rats are placed in a supine position and the time inseconds to turn over to a prone position and place all four paws incontact with the surface is recorded.2. Negative geotaxis: animals are placed head down on an inclined board(45° C.) of 30 cm. The hindlimbs of the pups are placed in the middle ofthe board. The day they begin to turn around and climb up the board withtheir forelimbs reaching the upper rim is observed. From the day of theappearance of the negative geotaxis, the time in seconds to reach theupper end of the board is recorded daily.3. Sensory reflexes: the ear and the eyelid are gently touched with acotton swab and the first day of the ear twitch reflex and thecontraction of the eyelid are recorded.4. Limb placing: the back of the forepaw and hindpaw is touched with theedge of the bench with the animal suspended, and the first day oflifting and placing the paws on the table is noted.5. Limb grasp: the fore- and hind-limbs are touched with a thin rod, andthe first day of grasping onto the rod is recorded.6. Gait: the animals are placed in the center of a white paper circle of13 cm in diameter, and the day they begin to move off the circle withboth forelimbs is recorded. From the day of the appearance, the time inseconds to move off the circle is recorded daily.7. Auditory startle: the first day of the startle response to a clappingsound is observed. In conclusion, the results show that feeding animalswith diet enriched with a composition of the invention enhances thedevelopment of neural system.

Example 5 Effect of DHA and AA Conjugated to Phospholipids within Dieton Retina of an Animal Model

The fatty acid (FA) docosahexaenoic acid (DHA, 22: 6n-3) is highlyenriched in membrane phospholipids of the central nervous system andretina. G protein-coupled receptor (GPCR) signal transduction is acommon signaling motif in neuronal pathways, such as those involved inlearning, memory, olfactory-based discrimination, spatial learning, andvisual acuity.

Study design is according to Niu et al, 2004, Reduced G Protein-coupledSignaling Efficiency in Retinal Rod Outer Segments in Response to n-3Fatty Acid Deficiency, J. Biol. Chem., Vol. 279, Issue 30, 31098-31104.

Study Design

Animals are obtained at weaning (3 weeks of age). Weaning females arerandomly divided into dietary groups with the constraint that bothgroups had the same mean body weight; the animals are divided to groupsso that the mean weight of the animals in both group is similar. Thefemales in both dietary groups are mated, the offspring are culled, andthe dams are maintained on their respective diets during lactation. Atthe age of 21 days, the pups are dark-adapted overnight and sacrificedby decapitation under dim red light.

Diets

The animals received diets essentially as described in Table 3 or Table4:

Group I: reference diet, normal chow.Group II: a synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) only.Group III: synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) and phospholipids (PL) (for example,see table 2, fat blends 1-9).

Retina

G protein-coupled receptor (GPCR) signaling in retinal rod outer segment(ROS) membranes isolated from rats fed with the different diets isstudied. GPCR signaling is assessed in different steps: rhodopsinactivation, rhodopsin-transducin coupling, cGMP phosphodiesteraseactivity, and formation of metarhodopsin II (MII) and the MII-G_(t)complex.

Further, fatty acid composition in retina is measured.

Feeding animals with diet enriched with a composition of the inventionresults in higher signaling in retinal rod outer segment and in higherLC-PUFA content in retina.

Example 6 Effect of DHA and AA Conjugated to Phospholipids within Dieton Retina and Visual Acuity in an Animal Model

Electroretinography measures electrical responses of various cell typesin the retina, including the photoreceptors (rods and cones), innerretinal cells (bipolar and amacrine cells), and the ganglion cells.During a recording, the eyes are exposed to standardized stimuli and theresulting signal is displayed showing the time course of the signal'samplitude (voltage).

Study design is according to Kraft et al, 1987, The RatElectroretinogram in Combined Zinc and Vitamin A Deficiency,Investigative Ophthalmology & Visual Science.

Study Design

To assess the retinal function, animals are raised in dim illuminationwith different diets and Scotopic electroretinograms (ERGs) isperformed.

Diets

The animals received diets essentially as described in Table 3 or Table4:

Group I: reference diet, normal chow.Group II: a synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) only.Group III: synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) and phospholipids (PL) (for example,see table 2, fat blends 1-9).

Electroretinography

Scotopic ERGs are measured on animals at regular intervals during thecourse of the experiment. Prior to the ERGs, animals are dark-adaptedfor a minimum period of 12 hr. A standard EEG (Electroencephalogram)needle electrode is placed into the anterior chamber of the eye and areference electrode is placed subcutaneously into the skin of the headnear the upper eyelid to record the ERG. The eye is subjected to singlestimulus flashes of increasing intensity. The ERG is displayed on anoscilloscope and recorded on magnetic tape.

Animals in group III, that receive diet enriched with a composition ofthe invention demonstrate higher retinal sensitivity.

Example 7 Effect of DHA and AA Conjugated Phospholipids within Diet onGrowth and Brain and CNS Development in an Animal Model

The mammalian brain is particularly rich in long-chain polyunsaturatedfatty acids (PUFA), especially docosahexaenoic acid (DHA) [22:6(n-3)]and arachidonic acid (AA) [20:4(n-6)]. Maternal dietary DHA and AAeffect on the composition of rat pup myelin is examined in an animalmodel. Dietary lipids play an important role in myelin synthesis,particularly during the period of maximum myelination. The studies areconducted during the period of maximum myelination, which coincides withthe onset of hearing in rat pups.

Study design is according to Haubner et al, 2007, The Effects ofMaternal Dietary Docosahexaenoic Acid Intake on Rat Pup Myelin and theAuditory Startle Response, Dev Neurosci 29:460-467.

Study Design:

Timed-pregnant dams are received on day 2 of gestation. Upon arrival,dams are assigned to be fed with different diets, with free access todiets and water. Fresh diet is provided to the dams throughout pregnancyand lactation. The day of birth is designated as postnatal day (PND) 0.Dams from each diet group and their randomized litters are assigned tothe study. Pups are weaned on PND 21 and then fed the correspondingmaternal diets until PND 24 when they are killed by decapitation.Cerebrum and cerebellum are removed from pups per diet group for fattyacids analysis.

Diets

The animals received diets essentially as described in Table 3 or Table4:

Group I: reference diet, normal rat chowGroup II: a synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) only.Group III: synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) and phospholipids (PL) (for example,see table 2, fat blends 1-9).

Biochemical Analyses

The fatty acid composition of total lipid extracts prepared from dietsis determined by gas liquid chromatography. Homogenates of brain tissueobtained from all pups on PND 24 are prepared and myelin is isolated.The fatty acid composition of myelin is measured in total lipid extractprepared from the brains.

Group III, that receive diet enriched with a composition of theinvention demonstrate higher levels of DHA and AA in pup myelin:

Example 8 Effect of DHA and AA Conjugated Phospholipids within Diet onFatty Acid Composition in the Blood and the Brain of an Animal Model

Given that members of the (n-3) and (n-6) families compete for the samedesaturase enzymes, the effects of the supplementation of PUFA from onefamily on tissue deposition of the PUFA from the other family may be animportant factor to consider when determining which dietary PUFAcomposition is optimal for neural development. Therefore, using theartificial rearing model to directly feed infant rats experimentalformulae during the period of rapid brain development, allows for theprecise control of both the relative and absolute amounts of specificdietary PUFA. Furthermore, this method allows for the direct delivery ofthe diet to the pups during a period of brain development that roughlyparallels the third trimester and early postnatal period in humans orearly infancy in the preterm infant.

Study design is according to Ward et al, 1998, Long-ChainPolyunsaturated Fatty Acid Levels in Formulae Influence Deposition ofDocosahexaenoic Acid and Arachidonic Acid in Brain and Red Blood Cellsof Artificially Reared Neonatal Rats, The Journal of Nutrition Vol. 128No. 12 December, pp. 2473-2487.

Study Design

The pregnant darns are obtained at 10-12 days gestation and housedindividually with free access to diet and tap water. Offspring oftimed-pregnant animals are culled, when necessary, within 24 h of birth,and approximately equal numbers of male and female offspring areselected as subjects. Pups are assigned randomly to groups diets. Milksubstitutes with or without DHA and/or AA, are fed from days 5-18 oflife, which are the period of rapid brain development.

Diets

The animals received diets essentially as described in Table 3 or Table4:

Group I: reference diet, normal rat chow.Group II: a synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) only.Group III: synthetic diet whose fat source is enriched with DHA and AAesterified to triglycerides (TG) and phospholipids (PL) (for example,see table 2, fat blends 1-9).

Artificial Rearing Procedure

On Day 27 post conception (approximately Day 5 after birth), pups areanesthetized, and the gastrostomy tube is inserted into the mouth, downthe esophagus, and out through the stomach wall. Pups are housedindividually fed one of the experimental diets via tubing. Each day, allpups are weighed to assess growth. Suckled control pups are notgastrostomized, but are fostered to nursing darns on the day ofgastrostomy. On day 40 postconception (approximately day 18 postbirth),animals are sacrificed, blood is removed by cardiac puncture, and brainsare removed and divided into FB and CB.

Biochemical Analysis.

Fatty acid composition is assessed in both the blood and the brain tostudy the relationship between brain and Red Blood Cells (RBC)composition. The brain is subdivided into forebrain (FB) and cerebellum(CB) because, in rats, developmental events that occur prenatally in theFB occur to a large extent postnatally in the CB. Therefore, dietaryeffects that have specific effects on rapidly developing tissue should,during the early postnatal period in rats, produce greater effects onthe CB than on the FB.

Group III, that receive diet enriched with a composition of theinvention demonstrate higher levels of DHA and AA in blood and brain,meaning better intestinal absorption.

1-47. (canceled)
 48. A composition, comprising: at least onetriglyceride comprising a compound of formula I:

wherein R₁, R₂ and R₃ may be identical or different and are eachindependently selected from the group consisting of H or an acyl group,wherein the acyl group is selected from the group consisting of asaturated fatty acid, mono-unsaturated fatty acid and long chainpoly-unsaturated fatty acid (LC-PUFA) residues; and at least one longchain poly-unsaturated fatty acid (LC-PUFA); and at least onephospholipid comprising a compound of formula II:

Wherein R₄ and R₅ are each a substituent having independently themeanings of R₁, R₂, R₃; and in which R₆ is selected from a groupconsisting of choline, inositol, ethanolamine and serine; Wherein atleast 1% of the LC-PUFA in the composition is conjugated to at least onephospholipid; And wherein the LC-PUFA's in the composition comprisingarachidonic acid (AA) and docosahexaenoic acid (DHA) conjugated totriglycerides, and to phospholipids, with the weight content of AA inthe composition being larger than that of DHA.
 49. A compositionaccording to claim 48, comprising (a) two or more triglycerides offormula I; (b) two or more phospholipids of formula II; (c) long-chainpolyunsaturated fatty acids (LC-PUFA's); the LC-PUFA's comprising (i)free LC-PUFA's, (ii) LC-PUFA's conjugated to the triglycerides, and(iii) LCPUFA's conjugated to the phospholipids.
 50. A compositionaccording to claim 48, wherein at least about 2% of the LC-PUFA contentof the composition is conjugated to said at least one phospholipid. 51.A composition according to claim 48, wherein the weight content ratiobetween AA and DHA is at least about 1.1.
 52. A composition according toclaim 48, wherein R₅ is an LC-PUFA residue.
 53. The composition of claim52 wherein the LC-PUFA residue comprises a docosahexaenoic acid (DHA) orarachidonic acid (AA).
 54. A composition according to claim 48, whereinR₄ is an LC-PUFA residue.
 55. A composition according to claim 48,wherein the total amount of phospholipids is at least about 5%.
 56. Acomposition according to claim 55, wherein the total amount ofphospholipids is at least about 7%.
 57. A composition according to claim56, wherein the total amount of phospholipids is at least about 10%. 58.A composition according to claim 57, wherein the total amount ofphospholipids is at least about 15%.
 59. A composition according toclaim 58, wherein the total amount of phospholipids is at least about20%.
 60. A composition according to claim 48 further comprising at leastone triglyceride of formula I, having at least 30% (w/w) of totalpalmitic acid conjugated at the sn-2 position.
 61. A compositionaccording to claim 48 further comprising at least one triglyceride offormula I having the following conjugated fatty acid profile 0-10% C8:0fatty acids out of the total fatty acids; 0-10% C10:0 fatty acids out ofthe total fatty acids; 0-22% C12:0 fatty acids out of the total fattyacids; 0-15% C14:0 fatty acids out of the total fatty acids; 15-55%C16:0 fatty acids out of the total fatty acids of which at least 30% isconjugated at the sn-2 position of triglyceride; 1-7% C18:0 fatty acidsout of the total fatty acids; 20-75% C18:1 fatty acids out of the totalfatty acids; 2-40% C18:2 fatty acids out of the total fatty acids; 0-8%C18:3 fatty acids out of the total fatty acids; and other fatty acidspresent in levels of less than 8% of the total fatty acids.
 62. Acomposition selected from the group consisting of a pharmaceutical, anutraceutical, a functional food and an infant formula, the compositioncomprising the composition of any one of claims 48 to
 61. 63. A methodfor improving, promoting or maintaining the development of cognitivefunctions or the development of brain and retina or the development ofvisual acuities or the development of CNS in a subject comprisingadministering to said subject a composition of any one of claims 48 to61.
 64. A method for improving, promoting or maintaining the growthquality or intestinal maturity of a subject by administering to saidsubject a composition of any one of claims 48 to 61.